Marking machine



Aug. 10, 1943. T. BARIS H MARKING MACHINE,

Filed Sept. 27, 1941 THOMAS BAR/6H- Fatented Aug. 10, 1943 UNITED STATESPATENT OFFICE 6 Claims.

This invention relates to marking machines and more particularly tomachines for markin metal surfaces.

Metal parts have heretofore been marked by marking tools which areplaced against the surface and struck with a hammer or the like toimpress the characters on th face of the toolinto the surface. Thisaction is very apt to d e the piece to be marked, particularly in thecase of relatively thin plates or like metal parts which may be warpedordeformed by the impact of the tool.

The present invention has for one of its objects the provision of amarking machine in which metal parts may be marked quickly and withoutany danger of damage thereto.

Another object of the invention is to provide a marking machine in whichparts are marked without impact and with a relatively slight pressure.

Still another object of the invention is to provide a marking machine inwhich the marking tool is given a high speed vibratory movement toimpress the marking into the metal surface.

The above and other objects and advantages of the invention will beapparent from the following description when read in connection with,

the accompanying drawing, in which the single figure is a side view withparts in section of a marking machine embodying the invention.

The illustrated machine comprises a base In, adapted to be supported ona floor or table, and having an upright post IZeXtending from one sidethereof. The post is formed on one surface with rack teeth 14 andslidably receives a carriage 16 for vertical sliding movement on thepost. Movement of the carriage I6 is controlled by a pinion l8,rotatably mounted thereon and meshing with the rack teeth I4, rotationof the pinion It? being controlled by a handle 20.

The carriage l6 includes an annular supporting portion 22, carrying anannular bushing 24 of yielding material such as rubber, in which thecasing 26 of an electric motor is supported. End caps 28 are rigidlconnected to the motor casing 26, and carry bearings 30 in which anarmature shaft 32 is rotatably mounted. The armature shaft carries anarmature 34 cooperating with desired to impress in the metal surfaces tobe marked. According to the present invention, the

armature 34 is unbalanced about the axis of the shaft 32, so as to setupa rotary translatory movement and to impart such movement to the tool sothat it will cut into the metal surface more readily. As shown, thearmature is bored out at one side, as indicated at 42, to unbalance itfor this purpose.

In operation, the piece to be marked may be supported on a block 44 onthe base l0, and the marking tool may be moved against the piece byoperation of the handle 20. The motor is oper marking characters 40 willcut into the metal surface. The rubber mounting 24 yields during thisoperation to permit translatory movement of the entire motor and toolassembly, the movement at the tool face being preferably of themagnitude of about 95000 of an inch. I have found that with thisconstruction the marking tool will cut rapidly into the surface of themetal piece to be marked without requiring that the tool be pressedagainst the surface with an extremely high pressure or that any impactwhatever be employed. Thus, pieces formed of relatively thin metal maybe satisfactorily marked without any danger of bending or warping any ofthe pieces.

The method of marking as carried out by the machine of the presentapplication is more particularly described and claimed in my co-pendingapplication, Serial No. 412,640, filed September 27, 1941.

While one embodiment of the invention has been shown and described indetail, it will be understood that this is illustrative only, and is notI adapted to be pressed against a surface to be suitable field windingsin the casing to be rotated marked, and. means for imparting to the toolwhile it is pressed against the surface a high speed vibratory movementof relatively small magnitude in the plane of the surface.

2. A marking machine for metal surfaces comprising a marking tool havingon its face projecting marking portions of relatively small area adaptedto be pressed against a surface to be adapted to be pressed against asurface to be marked, a member rotatably mounted on an axis rigidwithandperpendicular to the face of said tool, and means for causing saidmember to rotate at relatively high speed. said member be ing unbalancedabout its axis to give a rotary translatory movement to the tool.

4. A marking machine for metal surfaces comprising a marking tool havingon its face proiecting marking portions of relatively small area adaptedto be pressed against a surface to be marked, a member rotatably mountedon an axis ri id with and perpendicular to the face of the tool,yielding supporting means for the member which the ends of the shaft areiournalled, the armature having means decreasing the weight thereof onone side of the shaft with respect to the weight thereof on the otherside of the shaft, whereby rotation of the armature and shaft causes theheavier side of the armature to exert on said members a force which isexerted radially outward from the axis of the shaft and which constantlychanges radial direction with the rotation of the armature, and amarking tool having on its face projecting marking portions 6. A markingmachine comprising a support, a motor resilientlymounted on saidsupport, said motor com-prising field coils, a rotatable armature havinga shaft, and members in which the ends of the shaft are iournalied, andmeans for causing said armature, when rotated, to exert on said membersa force which is exerted radially out-- ward from the axis of the shaft,and which conand tool, and means tocause the memberto rotate about itsaxis. said member being eccentricallv balanced about its axis so thatthe member and tool will have a rotary translator-y movement in theyielding supporting means.

5. A marking machine comprising a motor having a field coil. anarmatura'a shaft extending.

axially through the armature, and members in stantly changes radialdirection with the rotation of the armature, whereby the members aregiven a rotary translatory movement with respect to the support, and amarking tool having on its 'face projecting marking portions ofrelatively small area carried by one of said members.

I morass semen.

of'relativelvsmall area carried by one of said v members 4

